Alien in the Classroom (Nancy Drew Notebooks #23)

According to the National Snooper, the queen of planet Zagon is on earth. It seems pretty silly until Nancy and her friends have a new substitute teacher...Ms. Zagon! Kate Zaleski says Ms. Zagon is an alien. Nancy says she's not, and she's going to prove it -- along with the aid of a talking parrot who's helping her solve the whole mystery.